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Northwest Africa 8291
Basic information Name: Northwest Africa 8291
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8291
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 296 g
Meteoritical Bulletin:  MB 103  (2014)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 217 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 14 Mar 2014
Writeup from MB 103:

Northwest Africa 8291 (NWA 8291)

(Northwest Africa)

Purchased: 2013

Classification: Mesosiderite

History: Purchased by Brahim Tahiri from a Moroccan meteorite hunter and sent to his partner Sean Tutorow for classification, 2013.

Physical characteristics: 45 small stones that are visually identical, irregular dark exterior with some iron staining, saw cut reveals mm-sized, bright metal grains set in dark brown silicate matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 70% silicate minerals and 30% metal. Silicate mineralogy ~70% pyroxene, ~25% plagioclase, accessory silica and olivine. Silicate grain sizes up to 300 μm. Metal: ~90% kamacite, ~10% taenite, 5-10% of total metal is oxidized. Metal domains up to 3 mm. Many metal/oxide veinlets and blebs throughout.

Geochemistry: (C. Agee and H. Miley, UNM) EMPA. Low Ca-pyroxene Fs32.4±7.0Wo2.7±0.7, Fe/Mn=28±2 n=9, olivine Fa31.7.7, Fe/Mn=43, n=1, plagioclase Or0.5±0.1Ab9.0±1.5An90.5±1.6, n=7.

Classification: Mesosiderite

Specimens: 20.95 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):295.7
Classifier:C. Agee, UNM
Type spec mass (g):20.95
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G509; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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